已知x+y=-5 , xy=6, 则x²+y²=?

已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y) 已知2/X-1/Y=3,则(X-2Y-XY)/(5XY+6Y-3X)=? 已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=? 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= （x+1)(x-1)(x²-1) 已知x+y=-5,xy=6,则x²+y² 已知x+y=6,xy=-3,则x²y+xy²= 已知x+y=6,xy=-3,则x^2y+xy^2=? 已知x+y=6,xy=-3,则x∧y+xy∧2= 已知x-y=5,xy=3,则3xy-7x+7y=? 已知:x-y=7,xy=5,则3xy-7x-7y=? 已知x+y=1,xy=1/5,则x^2y=xy^2 已知x+y=5,xy=2则x^2y+xy^2=( ) 已知x+y=5,xy=-3,则x^2y+xy^2, 已知x+y=5,xy=6,求x²y+xy²的值 已知（X+Y-3）²+|5+XY|=0,则X-XY+Y 已知5x*x-xy-6y*y=0,求xy的比值 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 已知（x+5)+|y*y+y-6|=0,则y*y-5分之一xy+x*x+x*x*x=